Process of printing from engraved plates.



Mama 1-, mm M? 3a T. R. DEMERY. PROCESS OF PRINTING FROM ENGRAVEDPLATES.

APPLIUATION FILED 111N328, 1911.

1,025,250. I PatentedMay 731912.,

3 SHEETS SHBET 1.

COLUMBIA PLANounAPn COWWASHINUTON, D. C.

T. R., DEMERY.

PROCESS OF PRINTING FROM ENGRAVED PLATES.

APPLICATION IILBD JUNE 28, 1911.

1,025,250. r P Patented May '7, 1912.

3 SHEETS-SHEET 2.

NATIONAL WMW w. 1PM $9M COLUMBIA PMNDORAPH CO" WASHINGTON. D. C.

T. R. DEMERY.

PROCESS OF PRINTING FROM ENGRAVED PLATES. 4 APPLIOATION FILED JUNE 28,1911. I 1,025,250. 7 Patented May 7, 1912.

3 SHEETS-SHEET 3.

WW v fi zw 8mm Mom/M38 UNITED STATES PATENT OFFICE.

THOMAS H. DEMEBY, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO MAX ZEITLERENGRAVING & SUPPLY (30., OF PHILADELPHIA, PENNSYLVANIA.

PROCESS OF PRINTING FROM ENGRAVED PLATES.

To all whom it may concern:

Be it known that I, THOMAS R. Dunner, a citizen of the United States,residing at Philadelphia, in county of Philadelphia and State ofPennsylvania, have invented certain new and useful Improvements inProcesses of Printing from Engraved Plates, of which the following is aspecification.

My invention relates to an improvement in the process of printing fromengraved plates, and has for its objects the provision of a moreefficient wipe to prevent feathering or spur-ting, and the treating ofthe plate during said wiping operation in such a mannor that the inkwill adhere to a relatively small portion only of the surface, thussaving a large percentage of the ink which is ordinarily lost.

In the use of power presses for printing from engraved plates, the usualpractice heretofore has been to ink the entire engraved surface of theplate and to then pass it. under a pad provided with a paper wipe, whichremoved the surplus ink from the face, thus leaving the plate in theright condition for the printing contact. By this method, a considerablepressure must be applied to the pad which cleans the face of the plate.The dry paper wipe passing over the plate under this pressure wears awaythe finer parts of the engraving and materially reduces the life of theplate. A further objection to the use of this method is that the entireface of the plate being dry, the ink adheres to all parts and upon theremoval of the surplus ink all of this is lost. On ordinary work,probably 75% of the ink applied is removed by the wipe.

In the accompanying drawings, which illustrate one form of apparatuswhich might be employed to carry out my processz-Figure 1 is adiagrammatic view to show the relative positions which the several partswould occupy in the plate press, Fig. 2 is a plan view of the counterwhich has been colored by printing an impression on it, and after thesuperfluous parts have been cut away, and Fig. 3 is a plan view of theinked plate prior to the wiping.

A, represents the frame of the press. The plate bed 1, is supported inthe usual manner by rollers 2, 2, which travel in trackways upon eachside of the frame, and the plate 3 is locked in this bed. A wiping pad4, is slidably mounted in the frame in Specification of Letters Patent.

App1ieation filed June 28, 1911.

Patented May 7, 1912.

Serial No. 635,745.

such a way that when the bed 3 isinoved in the direction of the arrow,the pad is raised out of contact, while upon the return, the pad isdepressed and has a wiping action across the face of the plate. Toobtain a clean surface upon the pad for each wiping action, a cloth wipe5 is provided. While any suitable cloth which would absorb moisturemight be used, I have found that a fabric which has a nap such as cantonflannel gives a more uniform dampness, a cleaner wipe, and presents asofter surface to the plate. The wipe is fed from a reel 6, over anidler rod 7, into the moisture pan 16, where it passes under theimmersion roll 8, thence up between the wringer rollers 9 and 10, overthe straightening rod 11, under wiping pad i, and up to winding roll 12.It is intended that a predetermined amount of moisture be retained inthe cloth, after it passes through the pan, and to insure this, thewringer roll 9 is journaled in the adjustable bearings 13, which arecontrolled by pressure screws 14. The wipe is moved the desired distanceover the pad by any suitable mechanism for turning wringer roll 10.

The engraved plate isinked by passing under inking roll 15, during itsrearward movement.

A pressure head 1'? carries the counter block 17 upon which the counter18 is built up. The counter is formed in the usual manner of card-boardand the like to a thickness of probably three-sixteenths of an inch andis then well beaten up or compacted, after which the superfluous partsare cut away to a distance of one-sixteenth or oneeighth of an incharound the engraving, as shown in Fig. 2.

Assuming that the counter has been pre pared and the press is inoperation, the steps are as follows: Referring to Fig. 1, the plate haspassed under the wiping pad where the face was wiped and covered with afilm of moisture. The moist plate with the ink in the engraved linesonly, continues its movement to the position shown. The pressure head isthen depressed and exerts a pressure upon the sheet which has been fedonto the plate to receive the impression. This pressure causes the paperto draw the ink from the lines, and at the same time absorb the moisturefrom those Sections of the face of the plate against which the counterpresses it. The plate with the ink removed and the face dry upon theengraved portion to a distance of one-sixteenth to one-eighth of an inchtherefrom, now has its movement reversed, passes beneath the raised padand under the inking roll Where the dry portion only is inked, andreversing, back beneath the depressed pad where it is wiped and theoperation thus continues as hereinbefore described.

The ink which is composed almost entirely of grease does not adhere tothe damp portions of the face of the plate, but only to the engravedparts, as illustrated in Fig. 3, and hence only about 25% of the inkwhich would be lost by the present process is wiped away.

It will be seen that I have evolved a process of printing from engravedplates which provides a more eflicient wipe, lengthens the life of theplate, and materially reduces the waste of ink.

Having fully described my invention, what I claim as new and desire tosecure by Letters Patent, is

1. The process of printing from engraved plates consisting in wiping theinked plate with a moist wipe, placing a sheet of paper against theplate under pressure to receive the impression, said pressure drying theplate only on the parts immediately surrounding the engraving, inkingthe dry portions only, and continuing the operation as before.

2. The process of printing from engraved plates consisting in wiping theinked plate with a wipe containing a predetermined amount of moisture,thereby depositing a film of moisture of a certain density upon theface, placing a sheet of paper against the plate under pressure toreceive the impression, absorbing the moisture upon those portions onlyof the face immediately surrounding the engraving, applying ink to thedry portions only of the face, and continuing the operation as before.

In testimony whereof I ailix my signature, in the presence of twowitnesses.

THOMAS R. DEMERY.

Vvitnesses BAYARD S. Coon, MICHAEL D. HAYES.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents.

